Upselling is about upgrading the customer to a bigger or better version of the product or service they're already buying, often seen in industries like food, finance, and retail. It's typically used when the customer is in the middle of a purchase decision or has just decided to buy, but can't be pushy or sneaky. Cross-selling, on the other hand, involves getting customers to buy different, related items in addition to what they're already buying, often by suggesting complementary products that will enhance their current purchase or make using that item easier. Both strategies aim to increase revenue and improve customer satisfaction, but are distinct in their approach, with upselling focusing on upgrading the existing product or service and cross-selling emphasizing adding value through new purchases. By mastering both techniques, businesses can maximize revenue and enhance customer experiences.